FR2689767A1 - Safety device allowing retraction by aspiration of the needle inside the body of a syringe after use. - Google Patents

Abstract

A device for reducing the risk of contamination due to accidental injuries, and preventing users of illicit substances from reusing a syringe. The device is designed to meet standards of safety, reliability and simplicity during both manufacture and use, and consists of a conventional syringe barrel wherein the forward portion (1) has an aperture (2) surrounded by star-like lines of weakness (3). A movable member (5) supporting a needle (7) and held in said aperture (2) is retractable into the syringe barrel after engaging an intermediate member (12) which is itself moved by the suction generated by movement of the (conventional) plunger (14). Said device is particularly useful for drawing the needle back into the syringe barrel by suction.

Description

DESCRIBE
The present invention relates to a device making it possible, after normal use of the usual hypodermic needles, to retract, by suction, the needle inside the syringe body in order to avoid any risk of accidental injury to the care and cleaning personnel.

This device limits the risks of contamination and excludes all possibilities of re-use of the syringe by consumers of prohibited substances.

It is designed with security, reliability and simplicity in mind, both in terms of manufacturing and use.

It consists of a syringe body of the conventional type having at its front part (t) an orifice (21 whose periphery is pre-cut (3) in the shape of a star.

A moving part (5), support of the needle (7), anchored in this orifice (2) is retractable inside the body of the syringe, after embolism with an intermediate part (in), itself displaced, by suction, according to the movement of the piston (14) (conventional type).

Hypodermic or equivalent needles, such as trocar or catheter cannulas, have been used for a long time in hospitals, clinics, laboratories and other medical places, to collect liquids for analysis or to administer medical care products.

 After use, these needles are destroyed or stored for destruction.

After use, the phase of separation of the soiled needle from the syringe body presents a very significant risk of accidental injury and contamination following care provided on subjects with communicable or highly contagious diseases.

 Also, this same risk results, for cleaning personnel, from the storage methods used before destruction.

In addition, there are serious risks of re-use by consumers of prohibited and dangerous substances as well as of contamination between consumer dlts.

 It is therefore essential to make the used needle inaccessible and unusable, immediately after its separation from the syringe body, in order to avoid any human contact, accidental or intentional, which could cause possible contamination.

In this perspective, devices have been designed to eliminate all dangers during the handling of the needle during and after its separation from the syringe and during its storage before destruction.

Have been proposed containers for collecting needles, the use of the syringe body as a container after use, self-locking and self-destructing systems, mechanisms, inter alia using springs, more or less complicated and not very compatible with industrial constraints. manufacturing, bringing the needle inside the syringe body and particularly a hooking system by means of a thread, as well as a slide system enveloping the syringe body and by translation covering the 'used needle.

Essential differences are made by the present device, taking into account the safety requirements for all the personnel handling used needles, taking into account the protection requirements in terms of contamination due to unauthorized use of needles recovered after use, also due to unsuitable storage methods, taking into account the drawbacks presented by the various prior devices which do not meet all of the security constraints to be taken into account: - Staff, at all levels of intervention, do not
must not handle soiled needles.

- Do not have to cover the soiled needle with
hood whose narrowness is a source of bites and
contamination.

. Reliability and simplicity of the system, not comprising
of mechanical parts and not causing modifications
- sensitive details of manufacturing methods and costs
industrial production.

- Adaptability of the system to all types of syringes
and existing needles.

L Less disruption in the employment habits of
users.

The device of the invention makes it possible to satisfy the pursued objectives of security, reliability, simplicity, to avoid the drawbacks presented by the various existing devices.

Consisting of a needle, a syringe body and a plunger as manufactured and marketed to date, the device adds to the existing a retraction function of the needle are performed by suction.

Indeed, the needle being normally fixed on its support, this one, independent part of the body of the syringe, is anchored in front part of the syringe in an orifice whose circumference is pre-cut in the shape of a star, allowing , after injection and during the forward movement of the piston, the deformation of the front part of the syringe body and, as a result, the introduction of the used needle into the body of the syringe during the rear movement of the pistor.

Any possibility of re-using the syringe is thus made impossible due to its deformation excluding any new filling.

It is a mobile intermediate piece which accompanies the stroke of the piston and which, at the end of the race, fits into the aforementioned support piece and. by suction, carries with it, inside the syringe body, during the rear movement of the piston, the support part and the needle attached thereto.

This movement, at its end, completely releases the piston while leaving inside, after air intake, the intermediate piece, the support piece and the soiled needle, without having to stop the piston.

The aforementioned orifice (2), partly in front of the syringe is dimensioned so as to allow the passage of the needle but to prevent the introduction of a finger, however small it may be. in order to exclude all injuries.

The syringe, before use, will be delivered with the intermediate part and the support not fitted so that the filling of the syringe is normally carried out.

In one of its forms of marketing, the syringe may be offered to its users filled with the liquid to be injected, thus acting as a bulb.

 @a description which follows, with reference to the accompanying schematic drawings, represents by way of nonlimiting example a form of execution of the safety syringe.

Figure 1: general view of the syringe.

Figures 1a and 1b: details of the parts:
views from above (1a),
views from below (1b).

Figures 2, 3, 4, 5: partial front views (2),
and after (3) filling,
at the end of injection (4),
retraction of the piston (5, bis and ter),
Figure 6: detail of the fitting phase of the parts
concave and convex (9 & i of the intermediate (12) and support (5) and cutting (3) parts of the front part (1) of the syringe.

Figure 1 shows a standard type syringe, according to the invention:
The end (1) is pierced with a circular orifice (2) matched with a pre-cut (3) in the shape of a star.

Is anchored in this orifice (2) through the groove (4) the support piece (5) whose conical shape (6) of the end allows normal attachment of a standard needle (7).

This piece (5), support of the needle, is molded in the materials usually used for the manufacture of syringes according to the sealing constraints of the piston head. The molded shape presents on the periphery of the piece (5) a groove (8) sealing and on the back a part (9) concave circular having a circular shoulder (10) and having a certain elasticity due to the materials used.

This part (5) is pierced axially (11) in the middle to allow the syringe to be filled.

An intermediate piece (12), molded, of the same material as the previous one (5), mobile and equipped with a groove (13) ensuring sealing, follows the movement of the piston (14) backwards during the filling phase , then the movement of the piston forward during the injection phase.

Its molded shape has a circular convex part (15) having a circular shoulder (16) and also having a certain elasticity.

After the injection, the piston (14), at the end of the stroke, pushes the intermediate part (12) so that the convex part (15) of the latter embolises in the concave part () of the part ( 5) support of the needle and that the shoulders (10 & 16) of one and the other ensure the union.

The pressure exerted at the end of the injection causes the cutout (3) of the front part of the syringe body and releases the part (5), needle holder, previously anchored to the front part (1) of the syringe due to the groove (4) of the part (5).

The withdrawal of the piston backwards then causes, by suction, the traction of the intermediate parts (12) and support (5) together, thus causing the introduction of the needle into the syringe body.

Cutting the front part of the syringe (3) makes it non-reusable because it cannot be refilled again.

At the end of the stroke, towards the rear, the plunger disengages from the body of the syringe. An air intake (17) is made between the piston head and the intermediate piece (12) (Fig5bis)
The needle (7) and its support (5) thus remain inside the syringe (Fig5ter).

The piston (14) has no broken blind,
A variant may include a part (18), complementary to the support piece (5), constituting a circular seal improving the tightness of the device.

Another variant may provide a stop (19) in the rear part of the body of the syringe, facilitating the blocking of the needle / support piece / intermediate piece, after retralt of the piston.

Another variant of the device can provide for the solidity of the needle (7) and its support piece (5), particularly in the case of small models intended, among other uses for vaccines.

The present description of the device of the invention applies to all types of syringes, of any size, the purpose of the invention being to allow retraction by suction of the needle inside the body of the syringe.

Claims (10)

CLAIMS.  1). Safety syringe of the type usually used by health professions, allowing the withdrawal of the used needle inside the syringe, excluding after a first use a second filling of the syringe and therefore its reuse, consisting of a body syringe (20), a plunger (14) and a needle (7) Identical to the various models available on the market, designed to fit the technical and financial standards of the industrialization of such a product , characterized in that it comprises an intermediate-intermediate piece (12), movable inside the syringe body. This part has at the front a part (15) of convex fore as well as a shoulder (16) circular. This part is made movable towards the rear of the syringe body by the suction effect exerted by the piston. Moving towards the rear, this part (12) carries with it the movable and nestable support part (5) on which the needle is fixed.  2). Safety syringe according to claim i, characterized in that the support piece (5) on which the needle attached (7) is movable backwards and has a conical tip (6) to the front which is normally attached the needle and at the rear a part (9) be concave shape and a shoulder (1 (10) circular allowing the interlocking with the intermediate movable part (12).  3). Safety syringe according to Claims 2, characterized in that the intermediate (12) and support (5) moving parts of the needle are made of a material of the type used to manufacture the tette or piston according to the required sealing criteria.  These moving parts have a groove (8 & 13) on their edges as well as a flange (18), acting as a seal and ensuring the device is sealed.  4). Safety syringe according to Claims 1 and 2, characterized in that the syringe body has, at its front part, a circular orifice (2) of diameter such that it allows the end of the part (5) to be anchored 'needle, due to the groove (4) with which this part is provided.  5). Safety syringe according to claims @.  at the front (1) of the syringe body is pre-cut (3) in a star so as to allow, in the suction phase of the device towards the rear, the release of the movable part (5), support of the 'needle, as well as the passage of the needle base.  7 and 3 characterized in that the periphery of the orifice (2)  6). Safety syringe according to one of the preceding claims, characterized in that the open port (3) at the front of the syringe after pressing the piston in injection Tin is smaller than that of a finger, account given the security objective sought.  7). Safety syringe according to one of the preceding claims, characterized in that, after injection and due to the pressure exerted by the piston at the end of the stroke, the front part (1) of the syringe assumes a position such that rendering impossible any new filling of the syringe and therefore any new use for any new use.  8). Safety syringe according to one of the preceding claims, characterized in that during the rear movement of the piston causing the withdrawal of the needle by suction, thanks to the intermediate piece (12), the piston (14), after taking air (17), emerges from itself from the body of the syringe, without doing this it is necessary to break it (as proposed in other devices). The needle (7), support (5) and intermediate-intermediate (12) assembly remains inside the syringe body which then acts as a container before destruction.  9). Safety syringe according to one of the preceding claims, characterized in that it can be made available to its users with the needle secured to its support (7 & 5), thus making it particularly suitable for vaccinations .  10). Safety syringe according to one of the preceding claims, characterized in that it can be made available to its users filled with the liquid to be injected, thus acting as a bulb.